Progress on grain growth dynamics in sintering of nano-powders

Nanostructured materials, characterized by an ultrafine grain size, have stimulated much research interest by virtue of their unusual mechanical, electrical, optical, and magnetic properties. In this paper, the sintering process of nano-powders were reviewed, to which sintering of the traditional materials compared. The microstructural development, i.e., grain growth and densification during sintering as well as the mechanism of crystal surface diffusion and boundary migration were analyzed, and the dynamic models on sintering process were summarized by the relationship of grain growth and pores size, interface diffusion, densification rate, and sintering temperature. Finally, the research tendency of this major on the basis of above models was discussed.

Nanocrystalline ceramics changes the brittleness of traditional ceramics and enhances the intensity, toughness and super plasticity of ceramics At the same time,nanocrystalline ceramics affects the performance of material,such as electrics,magnetic,calorific,optics The performance and the trend of the development were reviewed in this paper

Li Hong

Papers

Nanocrystalline Ceramics and Its Applications